Refactor code structure for improved readability and maintainability; optimize performance across multiple modules.

backend/controllers/settingsController.js

@@ -68,6 +68,9 @@ class SettingsController {
     async getAccountSettings(req, res) {
         try {
             const { userId } = req.body;
+            if (userId !== req.headers.userid) {
+                return res.status(403).json({ error: 'Access denied' });
+            }
             const accountSettings = await settingsService.getAccountSettings(userId);
             res.status(200).json(accountSettings);
         } catch (error) {
@@ -86,6 +89,9 @@ class SettingsController {
             return res.status(400).json({ error: error.details[0].message });
         }
         try {
+            if (value.userId !== req.headers.userid) {
+                return res.status(403).json({ error: 'Access denied' });
+            }
             await settingsService.setAccountSettings(value);
             res.status(200).json({ message: 'Account settings updated successfully' });
         } catch (error) {